Caption: Blow-fly pupae. Close-up of a cluster of blow-fly (family Calliphoridae) pupae (centre) being held by a researcher. The rate at which blow-flies grow and develop is highly dependent on temperature and species. Under room temperature (about 20 degrees Celsius) the black blowfly (Phormia regina) can go from egg to pupa in 150-266 hours (6 to 11 days). When the third life-stage is complete, the larva will leave the corpse (where the egg was laid) and burrow into the ground where it pupates, emerging as an adult 7 to 14 days later.